Well, I tried my hand at doing the DMG-1 d-pad replacement using the pad from my old GB, and it failed horribly. The plastic was just refusing to cooperate when it came to being cut and was pinging off all over the place, leading to imprecise cuts. Eventually, it was whittled down to what I figured resembled the figures in the pictures in the wiki article, I installed it, and it turned my Zero into an unusable mess - the left diagonals turned hyper-sensitive, making even menu browsing a nightmare, and the pad would stick harder than the original one. So now I'm going to have to install the old d-pad back just so I can actually browse the menu and stuff.
Is that caused by age or something? Being a part from an original GB, it was fairly old and had been used quite a bit, but it was still perfectly fine when it was still in the GB. Would ordering a newly-made replacement make it easier to cut properly, and if so, is there a store that sells those that doesn't charge outrageous shipping fees and take incredibly long to ship to Germany like Kitsch-Bent, posted earlier in the thread, does?